Overclock.net › Forums › Components › Power Supplies › CX750M doesn't power on
New Posts  All Forums:Forum Nav:

CX750M doesn't power on

post #1 of 9
Thread Starter 
Hi,

I just bought this power supply (along w/ mobo and all), and when I plug it in, switch the power supply switch on, then I switch it on from the front ... I see no power, no lights, nothing.

What could I be doing wrong? Should I see the fan move a bit if I just plug the power supply in and turn it on by itself?

I thought maybe I had the Power on switch cable crossed or something when attaching to the mobo to turn things on, but checked that as well. Any ideas?
post #2 of 9
try reconnecting your cpu and mobo headers then try the power sw in multiple positions
Stryker-PC
(17 items)
 
 
Homemade NAS
(13 items)
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
Case
logisys 
  hide details  
Reply
Stryker-PC
(17 items)
 
 
Homemade NAS
(13 items)
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
Case
logisys 
  hide details  
Reply
post #3 of 9
Simple paper clip test

 
ThinkPad Yoga
(10 items)
 
 
CPUMotherboardGraphicsRAM
Phenom II X4 970 @ 4 Ghz Asus M4A88TD-V EVO IceQ-X 7850 2GB @ 1150/1400/1.15v G.Skill Snipers 8GB DDR3 1333 (2x4GB) 
Hard DriveHard DriveHard DriveHard Drive
Seagate Pipeline HD.2 500GB  WD Green 500GB Seagate NAS 2TB Seagate NAS 2TB 
Optical DriveCoolingOSMonitor
Asus DVD Burner CoolerMaster GeminII S524 Win 7 Pro x64 Samsung 24" S24D590 (1080p) 
KeyboardPowerCaseMouse
Logitech G510 TX750 V2 Corsair 600T Silver Logitech Trackball 
Mouse PadAudioOtherOther
Dead mouse carcass Logitech Z313 Linksys WRT54G w/ DD-WRT @ 225Mhz Samsung Galaxy S3 16GB - Rooted/Carbon Rom 
CPUMotherboardGraphicsRAM
Baytrail Quad Core @ 2.16 Ghz OEM Lenovo 20DAS02X00 Intel HD Graphics 8GB DDR3L 1600 
Hard DriveOptical DriveOSMonitor
240GB Kingston SSD N/A Windows 8.1 Pro 11.6" IPS Touch Display @ 1366 x 768 
KeyboardAudio
ThinkPad baby... HD Audio 
  hide details  
Reply
 
ThinkPad Yoga
(10 items)
 
 
CPUMotherboardGraphicsRAM
Phenom II X4 970 @ 4 Ghz Asus M4A88TD-V EVO IceQ-X 7850 2GB @ 1150/1400/1.15v G.Skill Snipers 8GB DDR3 1333 (2x4GB) 
Hard DriveHard DriveHard DriveHard Drive
Seagate Pipeline HD.2 500GB  WD Green 500GB Seagate NAS 2TB Seagate NAS 2TB 
Optical DriveCoolingOSMonitor
Asus DVD Burner CoolerMaster GeminII S524 Win 7 Pro x64 Samsung 24" S24D590 (1080p) 
KeyboardPowerCaseMouse
Logitech G510 TX750 V2 Corsair 600T Silver Logitech Trackball 
Mouse PadAudioOtherOther
Dead mouse carcass Logitech Z313 Linksys WRT54G w/ DD-WRT @ 225Mhz Samsung Galaxy S3 16GB - Rooted/Carbon Rom 
CPUMotherboardGraphicsRAM
Baytrail Quad Core @ 2.16 Ghz OEM Lenovo 20DAS02X00 Intel HD Graphics 8GB DDR3L 1600 
Hard DriveOptical DriveOSMonitor
240GB Kingston SSD N/A Windows 8.1 Pro 11.6" IPS Touch Display @ 1366 x 768 
KeyboardAudio
ThinkPad baby... HD Audio 
  hide details  
Reply
post #4 of 9
Thread Starter 
"try reconnecting your cpu and mobo headers then try the power sw in multiple positions"

I did that, no go.
Edited by rrlangly - 8/10/13 at 11:44pm
post #5 of 9
Thread Starter 
"simple paper clip test"

I put a paperclip in the header that attaches to the motherboard from the PSU. I had a fan connected and the fan turned on, though the fan within the PSU didn't turn, so I'm hoping it was because there wasn't enough of a load on it.

So that seems to tell me the PSU is working, but now why doesn't the motherboard fireup? I took the video card out, reseated CPU, RAM, and battery. Still nothing.
post #6 of 9
Quote:
Originally Posted by rrlangly View Post

"simple paper clip test"
. I had a fan connected and the fan turned on, though the fan within the PSU didn't turn, so I'm hoping it was because there wasn't enough of a load on it..

Hmm. In my experience with this test the PSU fan usually comes on if the unit is functioning properly. I have actually never had a case fan hooked up to the PSU like shown in the video. Not sure what that may or may not mean though...
 
ThinkPad Yoga
(10 items)
 
 
CPUMotherboardGraphicsRAM
Phenom II X4 970 @ 4 Ghz Asus M4A88TD-V EVO IceQ-X 7850 2GB @ 1150/1400/1.15v G.Skill Snipers 8GB DDR3 1333 (2x4GB) 
Hard DriveHard DriveHard DriveHard Drive
Seagate Pipeline HD.2 500GB  WD Green 500GB Seagate NAS 2TB Seagate NAS 2TB 
Optical DriveCoolingOSMonitor
Asus DVD Burner CoolerMaster GeminII S524 Win 7 Pro x64 Samsung 24" S24D590 (1080p) 
KeyboardPowerCaseMouse
Logitech G510 TX750 V2 Corsair 600T Silver Logitech Trackball 
Mouse PadAudioOtherOther
Dead mouse carcass Logitech Z313 Linksys WRT54G w/ DD-WRT @ 225Mhz Samsung Galaxy S3 16GB - Rooted/Carbon Rom 
CPUMotherboardGraphicsRAM
Baytrail Quad Core @ 2.16 Ghz OEM Lenovo 20DAS02X00 Intel HD Graphics 8GB DDR3L 1600 
Hard DriveOptical DriveOSMonitor
240GB Kingston SSD N/A Windows 8.1 Pro 11.6" IPS Touch Display @ 1366 x 768 
KeyboardAudio
ThinkPad baby... HD Audio 
  hide details  
Reply
 
ThinkPad Yoga
(10 items)
 
 
CPUMotherboardGraphicsRAM
Phenom II X4 970 @ 4 Ghz Asus M4A88TD-V EVO IceQ-X 7850 2GB @ 1150/1400/1.15v G.Skill Snipers 8GB DDR3 1333 (2x4GB) 
Hard DriveHard DriveHard DriveHard Drive
Seagate Pipeline HD.2 500GB  WD Green 500GB Seagate NAS 2TB Seagate NAS 2TB 
Optical DriveCoolingOSMonitor
Asus DVD Burner CoolerMaster GeminII S524 Win 7 Pro x64 Samsung 24" S24D590 (1080p) 
KeyboardPowerCaseMouse
Logitech G510 TX750 V2 Corsair 600T Silver Logitech Trackball 
Mouse PadAudioOtherOther
Dead mouse carcass Logitech Z313 Linksys WRT54G w/ DD-WRT @ 225Mhz Samsung Galaxy S3 16GB - Rooted/Carbon Rom 
CPUMotherboardGraphicsRAM
Baytrail Quad Core @ 2.16 Ghz OEM Lenovo 20DAS02X00 Intel HD Graphics 8GB DDR3L 1600 
Hard DriveOptical DriveOSMonitor
240GB Kingston SSD N/A Windows 8.1 Pro 11.6" IPS Touch Display @ 1366 x 768 
KeyboardAudio
ThinkPad baby... HD Audio 
  hide details  
Reply
post #7 of 9
It's possible the PSU has at least 2 separate +12V rails, and the external fan was connected to a different rail than used by the internal fan. I'm guessing that the CPU's 4/8 pin connector runs off a different rail.

Here's where a digital multimeter can be really handy.
post #8 of 9
the psu is listed as a single 12v rail and likely that the cpu does run on a separate area since it is much lower amperage.

a good idea to perhaps buy a psu load tester

also i would call for an rma newegg would more than happily exchange it
Edited by Blade 117 - 8/12/13 at 1:46pm
Stryker-PC
(17 items)
 
 
Homemade NAS
(13 items)
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
Case
logisys 
  hide details  
Reply
Stryker-PC
(17 items)
 
 
Homemade NAS
(13 items)
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
Case
logisys 
  hide details  
Reply
post #9 of 9
If the PSU has only a single +12V rail and the internal fan doesn't spin, either the PSU is designed to leave the fan turned off until the temperature gets hot enoguh, or the fan controller has a problem.

PSU load testers don't apply much of a load, and the ones without digital readouts can be useless and often say really bad PSUs are running fine.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › CX750M doesn't power on